Congruences | Part 6| Divisibility Tests

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This video is about Congruences | Divisibility Tests. We will know when an integer is divided by 2, 3, 4, 5, 6, 7, 8, 9, 10, 11.
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honestly, number theory should be taught at childhood

devd_rx
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Hello. I just want to ask why a1.10 is not replced by 2 in divisibility test for 4? Thank you

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